Is it normal for you stomach to swell when you have the stomach flu? I'm not prego...
Hope this helps:
http://www.mayoclinic.com/health/flu/FU99999
http://www.webmd.com/cold-and-flu/home-remedies-for-fast-flu-relief?
The flu can make you very gassy & bloated, but make sure it's not mono! It makes your internal organs, such as your spleen swell up.